add preliminary sunspec server and SunS test

[altendky]

No description provided.

[codecov]

Codecov Report

Merging #19 (5c24bcf) into main (05ba726) will increase coverage by 0.16%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
+ Coverage   99.66%   99.82%   +0.16%     
==========================================
  Files          12       17       +5     
  Lines         295      577     +282     
  Branches       22       37      +15     
==========================================
+ Hits          294      576     +282     
  Partials        1        1              

Impacted Files	Coverage Δ
src/ssst/__init__.py	100.00% <ø> (ø)
src/ssst/_tests/conftest.py	100.00% <100.00%> (ø)
src/ssst/_tests/sunspec/test_client.py	100.00% <100.00%> (ø)
src/ssst/_tests/sunspec/test_server.py	100.00% <100.00%> (ø)
src/ssst/exceptions.py	100.00% <100.00%> (ø)
src/ssst/sunspec/__init__.py	100.00% <100.00%> (ø)
src/ssst/sunspec/client.py	100.00% <100.00%> (ø)
src/ssst/sunspec/server.py	100.00% <100.00%> (ø)
... and 3 more

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